Electrical routine testing of high voltage bushings. Technical information

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1 Electrical routine testing of high voltage bushings Technical information

2 This document must not be copied without our written permission, and the contents thereof must not be imparted to a third party nor be used for any unauthorized purpose. Contravention will be prosecuted.

3 Contents 1 General 5 2 Test sequences Rated voltage U r < 300 kv Rated voltage U r 300 kv Test tap insulation 6 3 Test equipment kv AC test facility kv AC test facility Lightning impulse test facility 9

4

5 1 General 1 General Before delivery, each bushing is subject to an electrical routine test. The test is made in line with IEC standards or, on request, according to relevant IEEE standards. The test is made at room temperature, and for transformer bushings with the lower end submerged in oil. Capacitance and tan δ are measured in steps up to the power frequency withstand voltage, which is maintained for one minute. Capacitance and tan δ are also measured with decreasing voltage at the same voltage levels as before the one minute test. Measurements for detection of internal partial discharge (PD measurements) are also made. These measurements are carried out at the same time, and at the same levels, as the tan δ test. Bushings with rated voltage U R equal to or higher than 300 kv are routine tested with a dry lightning impulse voltage withstand test, when tested according to IEC In addition, a power frequency test of the test tap insulation is made on all bushing. 2 Test sequences Bushing routine tests are depending on if the rated voltage U R is below or above 300 kv. 2.1 Rated voltage U r < 300 kv Capacitance, tan δ and PD are measured at each voltage as detailed in section [kv AC] 1.05 U r 1.5 U r U r Voltage withstand level, 60 s duration U r 1.5 U r 1.05 U r 10 [kv AC] en 5

6 2 Test sequence 2.2 Rated voltage U r 300 kv Capacitance, tan δ and PD are measured at each voltage as detailed in section [kv AC] 1.05 U r U r Lightning impulse test with one reduced (60 %) and five full-wave pulses with negative polarity at specified BIL level (Standard IEC waveform) 10 [kv AC] 1.05 U r 1.5 U r U r Voltage withstand level, 60 s duration U r 1.5 U r 1.05 U r 10 [kv AC] 2.3 Test tap insulation The test tap comes in two sizes, depending on the bushing type. Test sequences as below. For bushings with ANSI voltage tap type A only 10 [kv AC] C 2 20 [kv AC] Voltage withstand level, 60 s duration 1 [kv AC] C 2, tan δ IEC type test taps 2 [kv AC] Voltage withstand level, 60 s duration 1 [kv AC] C 2, tan δ en

7 3 Test equipment 3 Test equipment kv AC test facility Gas capacitor 50 pf kv Test transformer 0.15 A kv Voltage divider 500 pf kv Oil tank with test object 600 mm - max. 365 kv We reserve the right to replace the equipment with equivalent. High voltage test transformer Type: Hipotronics model Rating: 475V / 400 kv 60 kva (Pri parallel) 475V / 200 kv 30 kva (Pri serial) Duty: 1 hour max 50 % duty Oil capacity: 1368 litres Weight: 2794 kg Standard capacitance Type: HAFELY Capacitance: pf Internal pressure: 3.6 kg/cm 2 Rated voltage: 500 kv Test voltage: 550 kv Voltage divider Type: Hipotronics / Hubbell PSF Zero indicator Type: Tettex AG 5501 / VM Tan δ bridge Type: Trüb Tauber Partial discharge detector Type: Robinson DDX 8003 Test tank Width: 600 mm Depth: 3500 mm en 7

8 3 Test equipment kv AC test facility Gas capacitor 32 pf kv Series resonant test circuit 2 A kv Voltage divider 1 nf kv Oil tank with test object 1100 mm - max. 750 kv We reserve the right to replace the equipment with equivalent. AC series resonant test regulator Type: Hipotronics model SR Rating: kv, 1500 kva, 50 Hz Duty: 1 hour maximum 50 % duty PD: <5 pc at 550 kv RMS <10 pc at 750 kv RMS Weight: kg Standard capacitance Type: ABB Components model CGA 1550 Capacitance: pf Rated voltage: 750 kv Test voltage: 800 kv Accuracy: <2 pc vid 750 kv Voltage divider Type: Hipotronics model CMD 2000 Tan δ and capacitance bridge Type: Tettex model 2809a Accuracy: Tan δ 1x10-5, capacitance 30x10-4 Partial discharge detector Type: Robinson Measuring sensor: <2 pc at 550 kv Test tank Width: 1100 mm Depth: 5400 mm en

9 3.3 Lightning impulse test facility Lightning impulse battery 50 kj kv Voltage divider 1 nf kv Oil tank with test object 1100 mm - max kv (LI) We reserve the right to replace the equipment with equivalent. Voltage divider Type: Hipotronics model CMD 2000 Impulse generator system Type: Hipotronics model IG Rating: kv, 50 kj, 1.2 µs +/-30 % Test tank Width: 1100 mm Depth: 5400 mm en 9

10 ABB Power Technology Products AB Components Visiting address: Lyviksvägen 10 Postal address: SE Ludvika, SWEDEN Tel Fax en,

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